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In accordance with emissions rules, more and more Tier 4 units are showing up on both UP and BNSF...specifically, the ET44C4 for BNSF. Like its ES44C4 ancestor, this unit is an A1A-A1A unit, with only the outside axles on either truck being powered. This is a specification that BNSF is absolutely in love with. They haven't purchased a standard C-C unit in probably five years now.
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